I have never used one but there are some nice ones ~ boards or cloths ~ on amazon
I just recently watched a video about one ~ it was interesting to see how someone else uses a pendulum ~ I always do things my own way ~ I don't read tarot cards the same way someone else does
the video I watched was about a board that someone made their self
people use pendulums on maps and other things
pendulum board 1
pendulum board 2